Thermo Scientific STP-120 User manual

TISSUE PROCESSOR
STP-120
SERVICE MANUAL
Version 01/14

STP 120 Tissue Processor - Service Manual
Page 2
CONTENTS:
CERTIFICATION.......................................................................................................3
GUARANTEE............................................................................................................3
SAFETY.....................................................................................................................4
TECHNICAL DATA...................................................................................................5
TOOLS AND MATERIALS REQUIRED ...................................................................7
TROUBLESHOOTING..............................................................................................8
THE UNIT DOES NOT START...............................................................................8
NO DISPLAY....................................................................................................... 12
THE PARAFFIN BATHS DO NOT HEAT UP....................................................... 13
WARNING MESSAGES ON THE DISPLAY ......................................................... 15
REPLACEMENT OF COMPONENTS ................................................................... 25
BATTERY............................................................................................................ 25
FAN ..................................................................................................................... 25
ACTIVATED CHARCOAL FILTER...................................................................... 26
MAINS SWITCH.................................................................................................. 26
BATH CONNECTOR........................................................................................... 26
DISMANTLING THE UPPER PART.................................................................... 27
LOCATION OF COMPONENTS AND REFERENCE NUMBERS ........................ 30
SPARE PARTS LIST ............................................................................................. 34
APPENDIX ............................................................................................................. 36
WIRING DIAGRAMS........................................................................................... 36
ATTENTION
This manual is designed for the exclusive use of service technicians
with adequate training in carrying out mechanical and electrical
repairs.

Modular Inclusion Centre - Technical Information
CERTIFICATION The manufacturer certifies that this instrument has been carefully tested
and verified and that it complies with all applicable specifications before
being shipped from the factory.
The instrument complies with all applicable international safety standards.
GUARANTEE This product is guaranteed against all defects in material and workmanship
for a period of 1 (one) year. Any parts that are proven defective during this
guarantee period shall be repaired or replaced by the manufacturer free of
charge. No other guarantee is either specified or implied. Any unauthorised
changes, or repairs carried out by third parties shall make this guarantee
null and void.
The guarantee expires in the event of inadequate or erroneous use of the
instrument, or in the event that warning or cautionary messages are
ignored. The manufacturer assumes no responsibility for any damage that
may be caused, except in the case of manifest intent or extreme negligence
on the part of the manufacturer.
This manual is subject to modifications and changes without previous
notification.
One copy of this Service Manual is supplied with each instrument. Further
copies may be requested by indicating the version number, the number of
manuals required, the language (English, French or Spanish) and the date
of publication.

STP 120 Tissue Processor - Service Manual
Page 4
SAFETY
ATTENTION:
Please, observe the following general safety precautions when
operating this instrument.
Non-compliance with these instructions means that you are
invalidating the standards of safety and use for which this instrument
was designed.
The manufacturer shall not assume any responsibility for inadequate
use of the instrument or for any failure resulting from non-compliance
with basic safety requirements.
DANGER:
EARTH CONNECTION OF THE INSTRUMENT
The instrument should be connected to safety earth network to prevent any
injury caused by electrical shock. The instrument is fitted with a plug with
an earth terminal. The power supply should be connected to a safety earth
circuit and comply with the standards of the International Electrotechnical
Commission (IEC).
DANGER:
MAINS VOLTAGE
Do not remove the covers from the instrument while it is in operation. Any
replacement or adjustment of components should be only be carried out by
authorised trained maintenance staff. Disconnect the unit from the mains
power supply before opening or removing any covers.
DANGER:
RISK IN EXPLOSIVE ATMOSPHERES
The instrument should not be operated in any area where there is a risk of
explosion.
DANGER:
RISK OF RADIOACTIVE RADIATION
When working with radioactive specimens, all procedures applicable to
protection against radiation should be observed.
DANGER:
RISK OF INFECTION
Use appropriate safety and disinfection measures when working with
infectious specimens.






STP 120 Tissue Processor - Service Manual
Page 5
Technical Data
Type STP-120
EC Directives Refer to note on next page
Applicable Standards
Electromagnetic compatibility
Sizes
Diameter of the carrousel 850 mm
Height 500 – 700 mm
Diameter of the turning circle 670 mm
Weight
Including packing 145 kg
Net (fully equipped) 70 kg
Electrical installation
Rated Voltage (±10%) 100-120V ~ / 220-240 V ~
Frequency 50 – 60 Hz
Power consumption 400 VA
Fuses 115 V (2 x T4A)
230 V (2 x T2A)
Battery Nickel-Cadmium
(12V 600 mA)
IEC Classification 1010/EN61010-1
Degree of protection against electrical
shock. 1
Pollution class II
Noise < 70 dB
Capacity
Reagent stations
Number of reagent vessels 10 (9, if 3 are for paraffin.)
Volume per reagent vessel 1.8 L
Baskets for the specimen holders
Number of baskets 1 (option of 2)
Basket capacity 120 specimen holders
Paraffin stations
Number 2 (option of 3)
Volume 1.8 L
Rated Voltage 24 V ~
Rated power per station 100 VA
Temperature range 50 – 70 °C
Hysteresis margin 0.1 – 2 °C
Temperature cut-off 75 °C (± 4 °C)
Thermal protection Automatic reset

STP 120 Tissue Processor - Service Manual
Page 6
Programming
Number of programs 10 (selectable)
Programmable infiltration time per station from 1 s to 99 h 59 m
Rotation stirring selectable
Vertical shake selectable
Centrifugation selectable
Centrifugation time selectable
Program start delay selectable without time limit
Environmental conditions
Humidity max. 80% without condensation
Temperatures from 5 to 40 °C
Applied Directives and Standards:
Directives
73/73/CEE
Referring to the approximation of the legislation of the Member States on electrical
material destined for use within determined voltage limits
89/336/CEE
Referring to the approximation of the legislation of the Member States on
Electromagnetic Compatibility
Standards
Electrical Safety
UNE EN 61010-1(96)
+ A2 (96) + A2 Erratum (98)
Safety requirements for electrical equipment for measurement, control and laboratory
use. Part 1- general requirements.
UNE EN 61010-2-010 (96)
+ A1(97)
Safety requirements for electrical equipment for measurement, control and laboratory
use. Part 2- Particular requirements for laboratory equipment for the heating
materials.
UNE EN 61010-2-010 (99)
Safety requirements for electrical equipment for measurement, control and laboratory
use. Part 2-010: Particular requirements for automatic and semiautomatic analytical
equipment
Electromagnetic compatibility
EN 61326-1, 1997
Electrical equipment for measurement, control and laboratory use. EMC
requirements. Part 1: General requirements.
CISPR 22, 1993
Limits and methods of measurements of radio interference characteristics of
information technology equipment.
EN 55015, 1993
Limits and methods of measurements of radio interference characteristics of
household electrical appliances, portable tools and similar electrical apparatus.
IEC 1000-3-2, 1995
Electromagnetic compatibility (EMC). Part 3: Limits. Section 2: Limits for harmonic
current emissions (equipment input current £ 16 A per phase)
IEC 1000-3-3, 1995
Electromagnetic compatibility (EMC). Part 3: Limits. Section 3: Limits of voltage
fluctuation and flicker in low voltage supply systems for equipment with rated current
£ 16 A
IEC 1000-4-2, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 2: Electrostatic discharge immunity test. Basic EMC Publication
IEC 1000-4-3, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 3: Radiated, radio-frequency, electromagnetic immunity test. Basic EMC
Publication
IEC 1000-4-4, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 4: Electrical fast transients/ burst immunity. Basic EMC Publication
IEC 1000-4-5, 1995
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 5: Surge immunity test. Basic EMC Publication
IEC 1000-4-6, 1996
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 6: Immunity to conducted disturbances, induced by radio-frequency fields
IEC 1000-4-11, 1994
Electromagnetic compatibility (EMC). Part 4: Testing and measurement techniques.
Section 11: Voltage dips, short interruptions and voltage variations immunity tests.

STP 120 Tissue Processor - Service Manual
Page 7
Tools and materials
required Any maintenance work or adjustments to the STP 120 Tissue Processor
requires the use of the following tools and materials:
•Tester (Multimeter)
•Flat blade and Phillips screwdrivers (small and medium size)
•Allen keys in metric sizes.
•Small socket wrench in metric sizes
If it is necessary to replace temperature probes, apart from the
corresponding spare parts, the following items will also be required:
•Cyanoacrylate adhesive (e.g. Loctite, etc.)
•Silicone for semiconductors
•Standard neutral silicone
•Solvent and cutter
•Cable clamps (nylon/small)
•Sealed connection tags (for the paraffin baths)
Before taking any of the voltage readings, confirm the measurement points
by consulting the corresponding wiring diagrams included in this manual.

STP 120 Tissue Processor - Service Manual
Page 8
Troubleshooting
Problem:
THE UNIT DOES NOT START
Symptoms:
The 'POWER' LED does not light up.
1. Disconnect the unit from the mains power supply
2. Check the mains power supply cable.
3. Make sure that the mains voltage is the same as the voltage indicated in
the window beside the mains switch. Change the operating voltage by
inserting a screwdriver in the slot (see Figure). Open the fuse box
cover and invert the position of the red fuse holder as shown in the
diagram so that the correct voltage is displayed in the window.
Changing the
operating voltage
and fuse
replacement
Values of the fuses:
115 V →4 AT
230 V →2 AT
230 V
Check the power
supply fuses
Have they blown?
YES
Try to determine why the fuses blow.
Make sure there is no short-circuit.
Correct the fault.
Replace the fuses (115V/4AT or 230V/2AT), as described
above and go to the next step.
NO
Make sure that the fuse has been inserted correctly.
Make sure that the clips holding the fuse in the voltage
selector make good electrical contact with the fuse body. If
they do not make good contact, close them slightly.
Connect the unit to
the mains power
supply
Does it work
now?
YES
End of the procedure
NO
Any measurements made inside the unit first require
accessing the electronic system through the base. Proceed as
explained below to place the unit in an inclined position

STP 120 Tissue Processor - Service Manual
Page 9
Procedure for placing the
unit in position for
dismantling the base
1. Disconnect the unit from the mains power supply.
2. Activate the emergency battery:
- Turn the key switch located on the rear of the unit one
quarter turn to the right and hold it in position for about two
seconds.
- Return the key switch to the vertical position
3. Raise the cover of the unit by pressing the €key
4. Remove all the reagent vessels.
5. Remove the paraffin baths, but do not unplug the connectors to
prevent the control system from generating a message
indicating a temperature probe failure on start-up.
6. Lower the cover of the unit by pressing the €key
7. Place the unit in position for dismantling as shown in the
figure below and remove the lower front cover.
Dismantling position
$
ATTENTION: Before lifting the unit make sure that there is
sufficient space behind the unit to prevent the cover
bumping against any object if it needs to be raised.
Lift the unit by holding it at the base; never hold it by the
cover as this could cause irreparable damage.
Make sure that the round base of the unit is also firmly
supported by the table or workbench.
%
WARNING: Some of the following check procedures may
require connecting the unit to the mains power supply.
Exercise extreme care as some
components operate at mains
voltage.
Jig for holding the
unit in position for
dismantling
Make sure that the
unit is also
supported by the
edge of the round
base

STP 120 Tissue Processor - Service Manual
Page 10
8. Locate the resistance circuit board 1as shown in the figure below
Dismantling the
lower part
9. Connect the unit to the mains power supply.
10. Turn the switch to the ON position to power up the unit.
11. Use a multimeter (tester) to check that there is the same voltage as the
mains between terminals A and D on CON6 LINE IN of the resistance
circuit board (115V or 230V, as selected on the mains switch).
Measure the voltage
on resistance circuit
board CON 6 LINE IN
Is there voltage?
YES
Check whether there is the same mains voltage between
terminals A and D on CON6 TRF OUT of resistance circuit
board (115V or 230V, as selected on the mains switch).
NO
Turn off the unit. Disconnect the power supply cable. Replace
the lower cover and place the unit in a horizontal position.
Replace the mains switch with an identical make and model
as shown in the figure on page 26.
Once the mains switch has been replaced (fitted with a power
supply filter) turn the unit on and check whether it functions
correctly.
Resistance
circuit board
Resistance
circuit board
MICCAR V30
Circuit board
BASCAR V15
Circuit board
Ring
transformer
Front keypad
and display